An SD Premium class on Testing Mass Air Flow Sensors
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- čas přidán 26. 12. 2017
- ScannerDanner Premium offers a 14 day free trial available here www.scannerdanner.com/join-sc...
What if my MAF sensor is clean? What other tests should I perform to condemn a MAF sensor? Powers, grounds and signal circuit integrity testing is covered in this video.
Videos discussed in this ScannerDanner Premium lecture:
- Substituted values (Scan Data Can Lie To You!) MAF sensor fault
• Substituted values (Sc...
- MAF sensor trouble code (P0102) caused by a bad ground (GM 3100)
• MAF sensor trouble cod...
- Ford 4-wire MAF sensor wiring tests (integrity testing)
• Ford 4-wire MAF sensor...
- MAF sensor code P0102 from bad engine computer - (Chevy van)
• MAF sensor code P0102 ...
Interested in any of the tools I am using? Here are links for you
www.scannerdanner.com/tools.html
www.amazon.com/shop/scannerda...
For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium www.scannerdanner.com/join-sc... There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!
Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC. - Auta a dopravní prostředky
![Ground Side Switched, Duty Cycle Controlled, O2 Heater Circuit Testing [an SD Premium Class]](http://i.ytimg.com/vi/3ARUlTAy2EQ/mqdefault.jpg)
![Ground Side Switched, Duty Cycle Controlled, O2 Heater Circuit Testing [an SD Premium Class]](/img/tr.png)
It happened several times : struggling to figure something out,I take a moment to really think it through and Paul's teachings hit me! It's like a revelation! I pay very close attention to these videos, sometimes I watch them twice or rewind a section I didn't quite understand. Paul you are great man,God bless you!
Nick Nicu its like little gold nuggets of information that the harder we dig, listen to and soak in however many times it takes makes us more competent techs .
i dont mean to be so off topic but does anybody know of a method to log back into an Instagram account??
I was stupid lost my login password. I would appreciate any help you can give me
@Allen Houston instablaster =)
@Arturo Reign I really appreciate your reply. I got to the site on google and I'm trying it out now.
Takes quite some time so I will reply here later when my account password hopefully is recovered.
@Arturo Reign it worked and I finally got access to my account again. Im so happy!
Thank you so much you really help me out !
Excellent video Paul! You are an exceptional instructor! I’m a 2008 Wyotech grad and I have always struggled with electrical. I’m very good at mechanical but was frustrated with electrical. Your videos have truly helped me with electrical diagnostics and for that I gratefully thank you sir! Keep up the awesome videos!
Scanner Danner you are the best in the business my brother! I've been in the automotive repair industry since my early twenties and you my friend keep me up to date!
Thanks Paul.
The service you offer is invaluable.
Thanks Kevin!
I've been around the business since 1987 and I can't express how valuable your information is! Knowing circuit design and where you are in a circuit can save you a lot of time and headaches. I tell anybody I know looking for automotive training to go to your website. Thanks to you, I'm still learning new tricks.
Thank you Jeff!
This is one I'm going to save to my files, and watch over and over. Great lesson! Thanks Paul!
Thanks Smitty!
You’ve diverted me from being a parts changer to seeking & true mechanical failure reason repairs.
(Its less expensive & I don’t regret my work)
That's awesome man! Thanks for the comment and Happy New Year
Always great information Paul. I won't remember much, but with reputation and repeat viewing of your videos anything is possible. :)
wyattoneable that's my memory too friend : )
Yeah I hear that Wyatt! Just when I think I've got it, a week or so goes by and it's like I'm starting over again, lol.
I'm gonna save this one and watch it over and over until it sinks in. :)
Thank you for your videos, Happy New year for you and your family.
SUBSTANTIAL Sir ScannerDanner
Tutorial brilliant video love it From start to finish 👏 thank you Sir ScannerDanner
From Nick Ayivor from London England UK 🇬🇧
Great information! Thanks ScannerDanner im sure this will come in handy
Educational video as always Paul! Thanks!
Once again, you are a great instructor
Wow this is top notch stuff here. Bought the book, hoping to have the opportunity to watch more of these to get the lesson context on each chapter
Thanks so much! If you haven't joined yet, consider SD Premium from my website. You won't be disappointed.
www.scannerdanner.com/join-scannerdanner-premium.html
Thank you Paul for sharing these videos it's fantastic to see you teach and really wish I had the kind of opportunity that they have when I first started out. But better late than never and now I seek and travel to as much training as I can. Never can stop learning cause stuff is always changing.
Good. Tech. Happy New Year.
Excellent video great job
Great video Danner👍
Rosedale tech the school for young tech who really want something valuable by just watching scanner danner channel i had learn ed so much imagine going to Rosedale to learn from the real real real boss teacher educater in engine performance one won't regret. Mr paul danner keep sharing the good work .the real boss in you tube diagnostic videos second to none .scanerrrr dannerrrr.Rosedale Technical.
Thank you brother. Happy and Bless God New Year to you and your family.
Thank you Billy! God bless you too
Thank you very much! Paul. Of course Like!!!
Good video well explained.
ACCOMPLISHED Sir ScannerDanner
My teacher
Start to finish loved it tutorial thank you very much helpful video Take care and have a great Evening with all your family around you .God bless you my teacher
ACCOMPLISHED Sir ScannerDanner
From Nick Ayivor from London England UK 🇬🇧
The thing I hate the most about factory flow charts, is they have you separate and check various components independently. And if you are unable to find a problem, you must assume there is a failed component (ie. ECU, sensor, etc).
When testing the SD way, systems/circuits are tested more complete providing more evidence where the problem lies and often providing multiple ways to confirm the diagnosis.
Good work, Paul.
Great tutorial. @11.30 your Mitchell diagram came through for you again in showing the connector [ block ground ] that is associated with the sensor ground.
Nice job bro happy New Year to you and your family be safe
Happy New Year to you too Gary
YOU ARE THE MAN
skippy thanks paul great video
Question Danner,
Always struggled with pro demands wiring diagrams when the ECM has more than one plug... how do you identify which plug it is showing? Ive gotten burned a few times especially when there is an equal amount of pins on both connectors...
Needs more stink bugs.... ;). Good stuff as always Paul.
lol nice
Did I miss the part where the MAF gets smacked with a screwdriver handle and it's fixed?? lol Great job Mr. Danner with the explanation on testing and the theory behind it.
lol that's in the next episode
Another thumbs up.
im getting continuity between ground and signal pins with MAF unplugged.
Does the transistor keep the signal grounded in these 3 wire GM when the MAF is off the vehicle?
Paul you are excellent. The only problem I'm facing is i can't subscribe to the premium channel here in Zimbabwe.
On the Ford MAF with it unplugged is installing a strait jumper between the the PCM ground and MAF ground wires acceptable to provide a ground path for the chip in the computer? Should I use a resistor there as well to protect the ECM? I am thinking the only danger here would be if you accidentally fed voltage back into the ground side of the PCM ground with the connector unplugged (which could lead to some test light disasters if you were testing what you thought was a ground but it really goes to the PCM and is to provide ground to the chip in the other direction). Is there any resistance in that ground path from the PCM in the MAF when the connector is plugged in or is it a strait path to ground?
Question 1: Yes, this would work
2: If you are jumping to the 5v ref circuit as I did, yes, I suggest a resistor in case you jump the wrong pin or if the signal wire is shorted to ground. BTW the incandescent test light I use works great as a "resistor" here
3:It is a straight path to ground. A voltage drop test on both grounds should be less than 100mv with the sensor plugged in and active.
I'd love to have you as a teacher. I'm constantly watching your videos. How would I go about taking your class Mr. Danner?
You can subscribe on my website here www.scannerdanner.com/join-scannerdanner-premium/subscribe-to/3-scannerdanner-premium.html
There is a 14 day free trial. Thank you so much! I hope to see you there
Could a new groud be added to neg battery to get you back working?
Thanks!
Completely unexpected! Thank you so much! I assume this helped you fix your car? Or are you trying to learn this trade? If it's the latter
I would rather see you spend $11 for a month of access to my premium channel than this.
If you want, go to the home page of my website and register for a free account, then email me at support@scannerdanner.com
With your user name and email address you registered with and I will open it for you for the month. Really appreciate this gesture again
very goog my friend. gracias
Gracias Amigo
Awesome
hey scanner danner i did test on ford 1998 explorer ( o2 sensor ) an in obd2 generic did see voltage with finger on 12 volts an other finger on signal wire but not in vehicle specific mode .... using snap on verus edge ... i call snapon diag an made diagnostic complaint they have no answer why it worked or didnt work but just have to say i have many software issues with this tool ( verus edge 17.2 )
I have a vehicle power wire, ground wire, signal wire, return signal wire, plus signal and return wires (2) for the temperature. 6 wires total. The vpwr should be vehicle voltage-12/14, the ground should be grounded, the signal wire should be 5v, the signal return wire should be a sq wave between zero and 5 volts? Does that sound correct?
I have all of that but the sq wave. It just pulses every few seconds to a partial sq wave or a spike heart beat waveform. Did I do something wrong on set up of scope? Is maybe my scope not working correctly? Is there something wrong with my MAF signal? 2006 Ford F250 5.4L
Saludos desde chile
Saludos desde los Estados Unidos
That was funny to hear the guy in the class not know you were using OBD1 lol.
I've used an ALDL cable more than OBD2 for long time. A code 34 i would know, but something like a P1102 i would have to go look up
2:52.. the response to you bidirectional control.. (Hmmmm.!) lol
You obviously continue to amaze your students..As well as the rest of us too :)
Thanks Danner'man BTW..haven't seen anything new from your bro..whats up.?
HE had a video on the 27th or maybe I should say he posted a free premium video. Remember he works the school part time so he can do videos certain times of year so he works part of year, does videos other part and is probably playing or was playing Santa in the past week so he's probably on break as the rest are. This was just a estimated guess.......
Thank you Dale! But I think he was asking about my brother :-) He hasn't been producing videos for awhile.
You are correct though with me. When I have a class at the school, it is very difficult to produce videos with the same frequency. I'll be teaching until the end of January then my next class isn't for another two months. So Feb and March should have additional uploads.
I need to shoot a video and let people know what goes on behind the scenes. Family, life, teaching, troubleshooting, filming, editing, website, SD Premium move from CZcams, handling emails, customer support etc etc.
There are some that think this is easy :-)
OH Paul...Man, I wonder if you ever sleep. Your amazing to tackle all of that. Been watching for couple years now and I can't even say how valuable you truly are to the rest of us out here. Appreciate your hard work and the drive to continue doing what you do. Thank You.!
Yes, please do that full in life video. That would be fun and interesting to see and I think most would come to the reality of the difficulty of juggling all of these tasks.
Well, I hope all is well with James, miss his vids. And you can pass that on to him for me too. :) Hope that BMW stopped haunting him. Hahaha I'm sure he would know which one if you asked him.
Anyways...
Happy New Year to you and you family too. See you in 2018 Keep on Keepin on my friend.!
Cheers, Kevin
I have a 2005 gmc savana with a bad misfire I suspect my MAF so I backed probed it and it’s stuck at 2.2 and doesn’t change with rpms is my MAF bad
ECU is substituting mass air signals based on throttle angle, TPS and map if the engine has one. Is that solid advice. Never changes. Thats how its done. No look up tables….?
As always, a great video. Thanks. Does the Ford 4 wire MAF have its own built in 5v regulator? Or did I misunderstand? I know you got the 5v from another sensor to do the testing when the MAF was unplugged, but when it’s plugged in, it must make its own 5v. The power feed was 12v, right?
That is correct, no external 5v reference on this design (4 wire). The 5-6 wire one would have a 5v ref but it is actually the signal circuit of the built in intake air temperature sensor.
So a 12v feed, 2 grounds and an analog 0-5v signal that is generated completely by the MAF sensor (with is actually more accurately a module) itself.
ScannerDanner thanks for the reply. Also thanks for being willing to give the time and labor I know must go into doing what you do for us. You’ve opened my eyes to so much, and revealed mysteries I’ve wondered about for years. THANK YOU. A while back I got your book from AES Wave, (wonderful information) just curious, do you offer a paper version in color? This is not a complaint, I love the book, just wondering. Thanks again.
Thank you Jeff. I do not have a colored version in print. The eBook is in full color and I do offer $20 off the eBook for paper book owners or vice versa. Email me if you're interested in that at paul@scannerdanner.com
Thanks again!
It would be beneficial to have the equipment you work with.
Q: 94 Camaro Z28 obd 1 ~ i removed the screen from the MAF (thinking it would improve air flow) how or does this effect the integrity of the MAF readings and.. will it actually offset the air/fuel mixture and actually cause it to run less efficiently/effectively? Thanks!
BTW no codes or MIL’s..
(If i unplug the MAF connector while running it almost dies but stays running and doesn’t run all that different almost seemingly “better”.
Put the screen back in. It is a diffuser that ensures the MAF sensor properly measures the incoming air flow. Remember the MAF sensor only samples a portion of the air coming in and the screen ensures each column of air is the same flow rate. Look at your fuel trim readings before and after, you will see an improvement WITH the screen installed.
Bad on most
ScannerDanner
thanks- thats a straightforward reply, it totally makes sense. I guess the engineers designed it.
i can’t “improve” what is effective/efficiently designed
Thanks again- your videos are very specific and invaluable sir.
As you remarked, the signal on the scan tool for the maf could be a substituted value . Doing tests on the maf itself is the way to go ??
Just another thing to be aware of (substituted values)
This is one of the smartest guys i ever seen doing this type of diagnostics
I took my 2004 lb7 to the dealer due to a no start problem it took them over 4 weeks to get it going they said they had to reprogram the ecm, but when i finally got it back I ask well how does run? They said well the mechanic is afraid to drive it. its too scary to drive. I drove it and right away engine light came on. I scanned and it gave me a p0102 code maf air flow circuit A low. I check it and it appears its working fine. I clear it but it just comes back right away when it starts. i talk to a friend mechanic he said it could be the bad egr valve that also is brand new I never had that code before it when to the car dealer. i dont want to take it back to this idiots I had to replace the nuts and bolts on the turbo intake due to they stripped the nuts on it not counting oil leaks coming from the turbo outlet back into the engine. transmission lines leaking at the radiator in and out connections my stereo not working had to buy a new one $250 the wipers stopped working theres no low or mid only fast. the inside chime alarm dont I get a low oil level alarm on the engine yet the oil level is good wtf is going on here to begin with all this was working before i took it in well before the ecm took a crap. I got stuck with a bill for $2200 I called back told them the problem and they said basically they would start over like a new bill. I cant afford that right now I guess i'll wait until my truck is due for smog inspection next year and take it some where else
thank you my friend, you found the right channel for sure and if you have a code reader and a voltmeter I can help you troubleshoot that yourself
I have 5 volts constent power
And 12 volts on both other wires it's a 98 gmc 5.7 ltr with maf low sensor. I have installed new sensor no change
Also shows bad cam sensor
I installed new distributor codes stay the same what do you think is it a short or computer
Please help
HUNTIN-SHOOTIN- AIRGUNS...I see your question is over 2 months old, and had no response, so I thought I would give a shot!
From what he teaches in this video, if you have five volts on one wire, which is the signal wire from the computer, and 12v on both of the other two wires, that should indicate that there is a ground wire problem somewhere after your MAF sensor! Both wires with 12v means that power is getting to the ground side, but not going to ground, with no flow 12v will stay on the ground side!
Try this test! Unplug the circuit, turn the key on, use a D.V.O.M. to test the volts at each wire! Unplugged, it should be 5v then 12v then 0v! Turn the key off, and touch the volt meter leads Red to battery positive, then black to the one with 0v in the earlier test! That should show 12v, indicating that there is good ground. If it shows 0v then you need to track down where the ground is open! If it shows 12v, then use a test light, one end to battery positive, and touch the ground wire, that's unplugged at the sensor (just touch the terminal, do not try to force anything into the terminal to spread it open, and cause a bad connection) to see if the ground wire is connected to ground strong enough to carry electricity! If you then turn the key on, and use the test light to the 12v wire, then to the 0v wire, sensor unplugged, to see if the circuit will carry 12v to ground thru the test light as a load, the circuit is in good shape, and I can't tell you where to go from there! If anything else is wrong, then you need to track them down to fix it! If the test light shows good bright bulb when attached to battery, and attached to the sensor wires, maybe try a different load test, like adding another automotive light bulb in the test! It will show if the 12v power, and the ground wires are strong enough, not corroded, and firmly connected! The 5v line is from the computer, and is only 5v, and only comes from the computer, so if it's there, it's there! The sensor is a digital frequency type, and works by changing the frequency of how often per second it is switched on and off, to keep it to a predetermined amount of heat, calculating how much air is being passed over it to cool it off, showing how much air is getting in the engine!
One more test I used on my MAF, to determine that it was the issue, I grabbed it just after where the plug is attached, and twisted it a little bit, which caused the engine to stumble a tiny bit, whenever it "glitched" as I twisted it!! That showed me that all of the wires to and from the sensor were in tact, and the sensor mess up was caused by me, so it had to be the sensor, not other issues! I tried to not touch the plug or the wires, as I twisted it gently!! I think I just basically pushed on the sensor body, away from where the attaching screws were, but between those and the wire plug!
Here in az and those lower state we still have vehicle all the way back to the 70's still on the road as daily drivers. I saw a pinto wagon yesterday. I evan saw a pacer that been long ago. They take the newer stuff from say the 90's or newer and stuff them in the old cars not so much the trucks but the cars.
Hey Danner, I could really use your help in diagnosing my truck. I have two weeks until the registration expires and they wont let me register it without a passed inspection. I am not asking you to fix it for me, just give me some specific direction and how to diagnose my problem. Which codes are relevant to each other, which test I should run first. Interpreting the data pids, etc. If you could find some time to help, that would be greatly appreciated. I am not getting much assistance from the forum and I am a student of yours through your premium channel subscription. You help your other students...
Post to my forum my friend, we can absolutely help you and it's free to join www.scannerdanner.com
I read 2.5v on maf plugged in
Could this be correct? With the GM sensor yellow unplugged getting 5 Volts.
Sensor plugged in with ignition on reading 2.67V with Digital volt meter. Scope not available.
Also ground terminal B tested to body ground .5 ohm and under 100 mv. Maf Terminal C or pink
Ignition Positive Voltage Pink 12v good.
Problems: Any ideas? Thanks
After changing lower and upper plemiums after warm up in closed loop.
Codes for Map and TP. TP tests good with Ignition on testing. .5 Closed to 4.3 full thottle.
Erratic up and down idle then stall out. Runs at 1500 and above. 3800 V6 V2.
PO122, P1106, P0102, P1123.
define these codes for me so I don't have to look them up please. Thanks!
Yes, 2.67 volts on the signal with the MAF plugged in would be an average of the 0-5v square wave, but that is all that tells us, that there is a signal taking place, doesn't mean it is the correct frequency range. You need to switch your meter to HZ and check it at different loads.
@@ScannerDanner Thanks for taking the time to reply.
PO122 TP Circuit low voltage.
P1106 Map Inter High Voltage
P0102 Map low freq
P1122 TP Circuit Interm low voltage
P1123 incorrectly listed.
Starts up fine, just after warm up ,constant up and down idle. Then stalls.
Low cost scope idea? Could a scan tool DIY type be enough to isolate problem.Would a lab scope be cheaper than an auto type?
TP sensor with Fluke volt meter is .5 volt to 4.5 on meter.
Data obtained turo pro and new thinkcar diag software.
what year, make, model and engine?
@@ScannerDanner 1998 olds 88 ls 180K Fel pro lower and ATP upper installed, new iridium plugs and wires.
New Map sensor. Done by the instructions to solve excess coolant loss. New gasket sets for injectors.
@@ScannerDanner 1998 olds 180K
Abnormal Engine Coolant Consumption or Coolant Leak details:
www.underhoodservice.com/second-generation-repairs-servicing-the-gm-3800-series-ii-engine/
atpautomotive.com/featured/engine-intake-manifold
www.felpro.com/find-my-part.html
If degradation of upper intake manifold composite material is found,
replace the lower and upper intake manifolds with the following part numbers:
Part Number Description
89017554 Gasket Kit, Upper Intake Manifold
89017272 Manifold Kit, Upper Intake Use ATP Gasket included
89017400 Gasket, Lower Intake Manifold replace with Fel-Pro
24508923 Manifold, Lower Intake Not normally needed
Hello teacher
Do you have a video that shows how to locate a ground using the wiring diagrams? I don't know how to read them.
This playlist Rex czcams.com/play/PLAFYVCyenqcr32wgsCqa1Zj4335YlBF5p.html I have one in there with a MAF with a bad ground too
@@ScannerDanner I kind of figured it out but Mitchell diagrams do not show exact location. Only roughly where it is with a partial hard to read sketch. A real pic of the actual location and best way to get to it would have been helpful.
@@ScannerDanner I watched that series twice or five times for some videos. Don't have a 5k ohm resister. Is that something you just carry around in your toolbox? Your early chapters say the test light is acceptable to use. Does that not work for sensors and 5v signal wires? Does it have to match the resistance of your component?
@@rexluongo6470 I've changed that use since I've written this. I use an incandescent test light now instead. Chapter 10 signal circuit integrity classes I cover this my friend
@@ScannerDanner I am on chapter 5 right now. I thought you said in chapter 3 it was ok to use an incandescent test light (not an LED). That is why I asked because this contradicted what you said, but I thought maybe it was an exception because it was 5k ohm resistance instead of 100 ohms like the solenoids in chapter 3.
Also, I tried to purchase your paperback engine performance book, but the internet blocked me and your support team wouldn't send me an alternate way to pay. I would think for $100 they would figure out an alternate way to take my money, like zelle or bank transfer, credit card over phone etc etc???? Pretty hard to make a living if you turn business away.
the new vw models have a 4 wire maf sensor ground, 12v power supply, 5v signal but there is also another 5v supply coming from the pcm i don't know the reason behind the 5v supply from the pcm if you have any idea please answer me my greetings sir danner
Possibly and Intake air temp sensor signal. It will show 5v unplugged and a drop in voltage plugged in
@@ScannerDanner which means that the maf and iat share a common ground i think?
Correct
@@ScannerDanner thank you so much sir Paul i really appreciate your efforts i always go back to your videos when i'm lost
Nice videos, I know you do a lot of automotive , do you know any one that has a channel that does diesel videos like this?
Yes, czcams.com/channels/_q-0ppmnIRaEYR7LIX8tGA.htmlfeatured?disable_polymer=1
He doesn't have a lot of videos yet but he is your diesel guy for sure.
31:25 I'm surprised they chose dissimilar metals in a wet and possibly salty environment to hold the case together, this type of corrosion is referred to as galvanic corrosion
Where do I buy your literature?
www.scannerdanner.com thank you!
I'm having an issue with my 04 Chevy 6.0 . It has 5 wires at the MAF I checked the signal wire, and it has 5v ref but it's not a constant waveform it looks bad I've checked the sensor ground I've load tested it with a light bulb. Ground and power are good. I put the 5v ref from the MAP to the mass airflow sensor and I'm not getting a waveform just 5v I've tried different MAF sensor makes no change I'm not sure where to go next
I believe the 5-wire has an internal intake air temp sensor. But the MAF circuit is the same as a 3-wire. Which is a 12v feed, a ground and a 5v digital signal that operates at 2khz to 10khz. You cannot jump a 5v ref from another sensor to this circuit. It is a 5v pull-down design signal circuit, it is not a steady 5v ref.
The ECM sends out 5v (not reference voltage like what's on your MAP) and the MAF sensor pulls that to ground (on/off) to make a digital signal. It will not be steady as you saw and your voltmeter will be too slow to read it. You need to switch to a frequency scale to measure the actual signal
@@ScannerDannerthanks for taken the time to respond. First I want to thank you I've learned so much from you 😊 . So I am scoping the MAF signal wire I have the scope set to 20v - 10ms just like you had it setup in a video (GM MAF sensor circuit tests) should my waveform look like you showed in the video ? I have a 04 Silverado 6.0 not sure if waveform changes depending on the year. I've checked the ground and power I've tried different sensors but doesn't look like your example. I checked MAF (gm/sec) and MAF (Hz) they both match each other on scanner . Truck runs fine only issue is P0101 Im pretty sure I checked everything I'm thinking it's the PCM✌🏼
@@charliesolorzano8457 you need to pull up the flow chart for the P0101 code, there are other variables for this code than just the MAF and ECM
If you don't have access to service info. You can buy it oer vehicle and for $20 that's what I'd be doing
eautorepair.adtrk.biz/?a=10817&c=24&p=r&s1=
@@ScannerDanner ok thank you ✌🏼
@@charliesolorzano8457 yeah, there is a bunch of checks in that flow chart
Is Maf has to be exactly 5v or 4.66v ok?
On a GM? On the signal wire (yellow)?
Timing belt! Can cause maf codes
I have a Subaru crank but no start no fault codes but it I but a jump box on it and make the engine turn faster it starts. Plugs look good and injectors are firing. Just thinking maybe the mass airflow might be bad
When it is not starting, without the jump pack. Check spark and injector pulse as well as fuel pressure. Find out what you are missing then we go from there.
I've seen a bad power feed wire to fuel injectors cause this as well as a weak fuel pump
Thanks dan the only thing I haven't checked is the fuel pressure connected to engine I did do a dead head pressure and was good. When it does start I get a lot of smoke from exhaust for a min. Like too much fuel
@@Kc8qdq it's Paul Danner 😉
Anyway, that does sound like a flooded condition. Check your coolant sensor for sure!
what happens if you just reroute the ground some where easier to get to but still be a ground
you can do that
Send more
Send more what Larry?
I thin you lost them boys, boss.
무픞을 탁 치게 하네요 ㅋ